Molecular Mass
5 past-paper questions on Molecular Mass · examined 2020–2024.
20242 questions
The formula of ethanedioic acid is C2H2O4•nH2O. X contains 6.3 g of C2H2O4•nH2O in 100 cm3 of solution. Use your answer from (e) to calculate the relative formula mass, Mr, of C2H2O4•nH2O.
Use your answer from (f)(i) to deduce the value for n in C2H2O4•nH2O. Give your answer to the nearest whole number. [Ar: H, 1; C, 12; O, 16]
20231 question
The diagram shows the structures of the atoms of two elements, X and Z. X and Z are not the atomic symbols for these elements. The elements combine to form a compound. What is the mass of one mole of this compound?
20211 question
The names and formulae of three nitrogen compounds are shown. Which compound has the highest relative molecular mass, Mr, and in which compound is the percentage by mass of hydrogen the greatest?
20201 question
Calculate the Mr of Ca(OH)2.
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